Which of the following is NOT a characteristic color of the Flemish Giant?

The Flemish Giant breed of rabbit is known for its variety of colors, which include black, blue, and light gray among its standard colorations. Each of these colors is recognized within the breed standard for showing, contributing to the aesthetic diversity that can be found in Flemish Giants.

Tortoise, or tortoiseshell, is not recognized as a standard color for Flemish Giants. This color pattern is more commonly associated with other rabbit breeds. Therefore, recognizing that the Flemish Giant does not include tortoise as one of its breed-specific color characteristics is essential for understanding breed standards and proper identification in showmanship.